CN106788890B - A kind of wireless data transmission method and system - Google Patents
A kind of wireless data transmission method and system Download PDFInfo
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- CN106788890B CN106788890B CN201611140753.8A CN201611140753A CN106788890B CN 106788890 B CN106788890 B CN 106788890B CN 201611140753 A CN201611140753 A CN 201611140753A CN 106788890 B CN106788890 B CN 106788890B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/04—Speed or phase control by synchronisation signals
- H04L7/06—Speed or phase control by synchronisation signals the synchronisation signals differing from the information signals in amplitude, polarity or frequency or length
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0024—Carrier regulation at the receiver end
- H04L2027/0026—Correction of carrier offset
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- Computer Networks & Wireless Communication (AREA)
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- Quality & Reliability (AREA)
- Power Engineering (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
The invention discloses a kind of wireless data transmission method and system, the technical field of data transmission being related in wireless communication.The data transmission method includes: when terminal transmitting terminal is in uplink pilot time slot, and the receiving end Xiang Jizhan sends the sine wave of specific frequency；After the sine wave of specific frequency is sent completely, the receiving end Xiang Jizhan sends the PN sequence modulated through OQPSK, so that base station receiving end is timed synchronous use；After PN sequence is sent completely, the receiving end Xiang Jizhan sends the coded data modulated through OQPSK；Base station receiving end is synchronous with frequency deviation according to the sine wave progress channel estimation that terminal transmitting terminal is sent, and is timed synchronous and phase estimation according to PN sequence；After frequency deviation synchronization and Timing Synchronization, coded data is demodulated and decoded using phase estimation.The present invention can effectively improve the accuracy and reliability of wireless data transmission, meet data transportation requirements higher and higher under big data era.
Description
Technical field
The present invention relates to the technical field of data transmission in wireless communication, are specifically a kind of wireless data transmissions
Method and system.
Background technique
Wireless communication system (Wireless Communication System) refers to utilizing electromagnetism by wireless protocols
Wave transfer information data realizes a kind of system of communication.Currently, wireless communication system be already widely deployed for provide such as voice,
The various communication services such as video, packet data, information receiving, broadcast.Existing wireless communication system includes that can support many ends
Hold many base stations communicated on the forward and reverse links.Forward link (or downlink) refers to the communication chain from base station to terminal
Road, and reverse link (or uplink) refers to the communication link from terminal to base station.Terminal can be located at any in the system
Place, and each terminal any given time may be at zero, one or multiple base stations covering within.Terminal can
Allow these base stations to detect the terminal to transmit pilot tone on reverse link, then sends data to these base stations again, with
Realize the transmission of data.
Since wireless communication system is mainly used in the service such as voice, video, information receiving, broadcast, data are passed
Defeated accuracy, reliability and safety have high requirement.But with being continuously increased for terminal quantity, terminal transmission is increasingly
Intensively, load data and application diversity are more and more prominent, and the data volume for needing to transmit is multiplied, and data is caused to be transmitted
Accuracy and safety are severely impacted.And it is quasi- that existing wireless communication system has been unable to satisfy under big data era
Really, reliably, safety transmission requirement, therefore, how to improve wireless communication system data transmission when accuracy, safety be
This field urgent problem to be solved.
Summary of the invention
The purpose of the invention is to overcome the shortcomings of above-mentioned background technique, a kind of wireless data transmission method is provided
And system, the accuracy and reliability of wireless data transmission can be effectively improved, is met higher and higher under big data era
Data transportation requirements.
To achieve the above objectives, the present invention provides a kind of wireless data transmission method, comprising the following steps: S1: when
When terminal transmitting terminal is in uplink pilot time slot, the receiving end Xiang Jizhan sends the sine wave of specific frequency, and the specific frequency is
Randomly selected a kind of frequency from existing K kind nominal frequency；S2: after the sine wave of specific frequency is sent completely, Xiang Ji
The PN sequence that receiving end transmission of standing is modulated through OQPSK, so that base station receiving end is timed synchronous use；S3: it is sent out to PN sequence
After the completion of sending, the receiving end Xiang Jizhan sends the coded data modulated through OQPSK, and the coded data uses Error Correction of Coding；S4: base
The sine wave progress channel estimation that receiving end is sent according to terminal transmitting terminal of standing is synchronous with frequency deviation, is timed together according to PN sequence
Step and phase estimation；After frequency deviation synchronization and Timing Synchronization, coded data is demodulated and decoded using phase estimation.
Based on the above technical solution, the terminal transmitting terminal is realized specific using the communication chip of sx1276 model
The sine wave of frequency is sent；Its realization process includes following below scheme: FSK mode is set by sx1276 communication chip, in FSK mould
Under formula, sine wave freuqency is set；According to the sine wave duration and bit rate to be sent, data length is set；Using configured
The transmission of sx1276 communication chip realization sine wave.
Based on the above technical solution, the realization process modulated described in step S2 and step S3 through OQPSK is as follows:
To be sent 0,1bit data conversion is at 1 or -1；Real void is carried out to the data after conversion to be staggered；It is real empty to what is obtained
Alternating series, since first number, if the phase of subsequent number increases 90 ° relative to the phase of the number of front,
1 is obtained, if the phase of subsequent number reduces 90 ° relative to the phase of the number of front, obtains 0, according to above-mentioned rule
Corresponding 0 or 1 data are obtained by real void staggered 1 or -1；Obtain 0 or 1 data are sent into MSK or GMSK modulation
Device, which is realized, modulates the OQPSK of data.
Based on the above technical solution, step S4 specifically includes following below scheme: S401: base station receiving end is according to terminal
The sine wave that transmitting terminal is sent estimates the frequency of sine wave, phase and amplitude；End is obtained according to the amplitude and phase of sine wave
Hold the channel response of transmitting terminal；According to the frequency of sine wave, by the frequency of sine wave and with the frequency frequency difference of sine wave it is the smallest
Nominal frequency subtracts each other to obtain frequency deviation, to the reception signal compensation frequency deviation after sine wave, realizes Frequency Synchronization；S402: base station
Receiving end carries out related calculation the PN sequence received and known PN sequence, obtains timing offset；The timing offset is compensated, it is real
Existing Timing Synchronization, and phase estimation is obtained according to the phase of correlation；S403: it after Frequency Synchronization and Timing Synchronization, utilizes
Phase estimation demodulates and decodes coded data.
Based on the above technical solution, the Error Correction of Coding used in step S3 is convolutional code.
The present invention also provides a kind of wireless data transmission system for realizing above-mentioned transmission method, including terminal hair simultaneously
Sending end and base station receiving end, the terminal transmitting terminal include sine wave transmission unit, PN sequence transmission unit and coded data hair
Send unit；
The sine wave transmission unit is used for: when terminal transmitting terminal is in uplink pilot time slot, the receiving end Xiang Jizhan hair
Send the sine wave of specific frequency；
The PN sequence transmission unit is used for: after the sine wave of specific frequency is sent completely, the receiving end Xiang Jizhan is sent
The PN sequence modulated through OQPSK；
The coded data transmission unit is used for: after PN sequence is sent completely, the receiving end Xiang Jizhan is sent through OQPSK tune
The coded data using Error Correction of Coding of system；
The base station receiving end is used for: it is synchronous with frequency deviation to carry out channel estimation according to the sine wave that terminal transmitting terminal is sent；
Synchronous and phase estimation is timed according to PN sequence；After Frequency Synchronization and Timing Synchronization, using phase estimation to coding
Data are demodulated and decoded.
Based on the above technical solution, the sine wave transmission unit is realized using the communication chip of sx1276 model
The sine wave of specific frequency is sent；Its realization process includes following below scheme: FSK mode is set by sx1276 communication chip,
Under FSK mode, sine wave freuqency is set；According to the sine wave duration and bit rate to be sent, data length is set；Utilize configuration
Good sx1276 communication chip realizes the transmission of sine wave.
Based on the above technical solution, the PN sequence transmission unit and coded data transmission unit realize OQPSK
The process of modulation is as follows: to be sent 0,1bit data conversion is at 1 or -1；Real empty staggered row is carried out to the data after conversion
Column；To obtained real empty alternating series, since first number, if phase of the phase of subsequent number relative to the number of front
90 ° are increased, then obtaining 1, if the phase of subsequent number reduces 90 ° relative to the phase of the number of front, is obtained
0, corresponding 0 or 1 data are obtained by real void staggered 1 or -1 according to above-mentioned rule；Obtain 0 or 1 data are sent into
MSK or GMSK modulation device, which are realized, modulates the OQPSK of data.
Based on the above technical solution, the base station receiving end includes channel estimation and frequency deviation synchronization unit, timing
Synchronous and phase estimation unit and demodulating and decoding unit；
The channel estimation and frequency deviation synchronization unit are used for: estimating sine wave according to the sine wave that terminal transmitting terminal is sent
Frequency, phase and amplitude；The channel response of terminal transmitting terminal is obtained according to the amplitude and phase of sine wave；According to sine wave
Frequency subtracts each other to obtain frequency deviation by the frequency of sine wave and with the smallest nominal frequency of frequency frequency difference of sine wave, to sine wave it
The reception signal compensation frequency deviation afterwards realizes Frequency Synchronization；
The Timing Synchronization and phase estimation unit are used for: the PN sequence received is done related fortune to known PN sequence
It calculates, obtains timing offset；The timing offset is compensated, Timing Synchronization is realized, phase estimation is obtained according to the phase of correlation；
The demodulating and decoding unit is used for: after Frequency Synchronization and Timing Synchronization, using phase estimation to coded data
It is demodulated and decoded.
Based on the above technical solution, the Error Correction of Coding that the coded data transmission unit uses is convolutional code.
The beneficial effects of the present invention are:
Terminal transmitting terminal of the invention is according to uplink pilot time slot+PN sequence+entangle when carrying out the transmission of upstream data
What the frame format of miscoding data was sent, structure is simple and easy to implement for frame format.Specifically, terminal transmitting terminal is led in uplink
The sine wave of specific frequency is first sent when frequency time slot；After sine wave is sent completely, sends PN sequence: being sent completely to PN sequence
Afterwards, the coded data for using Error Correction of Coding is finally sent.Base station receiving end after receiving the data that terminal transmitting terminal is sent, according to
Sine wave progress channel estimation is synchronous with frequency deviation, is timed synchronous and phase estimation according to PN sequence；And frequency deviation it is synchronous and
After Timing Synchronization, coded data is demodulated and decoded using phase estimation, to realize the transmission of wireless communication data.
Compared with prior art, entire data transmission procedure of the invention is safe and reliable, and accuracy is high.Simple and reliable
Upstream data frame format to can guarantee effectively reliable transmission under the transmission of big data quantity, when meeting big data
Higher and higher transmission requirement under generation.
Detailed description of the invention
Fig. 1 is the flow chart of wireless data transmission method in the embodiment of the present invention；
Fig. 2 is the amplitude and phase schematic diagram of OQPSK signal；
Fig. 3 is the structural block diagram of wireless data transmission system in the embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the present invention is described in further detail.
Shown in Figure 1, the embodiment of the present invention provides a kind of wireless data transmission method, comprising the following steps:
Step S1: when terminal transmitting terminal is in uplink pilot time slot, the receiving end Xiang Jizhan sends the sine of specific frequency
Wave, the specific frequency are randomly selected a kind of frequencies from existing K kind nominal frequency.
It is understood that terminal transmitting terminal is using the communication core for being semtech company sx1276 model in the present embodiment
Piece come realize specific frequency sine wave send.When specific operation, realization process includes following below scheme:
Step S101, sine wave freuqency is set: setting FSK (Frequency-shift for sx1276 communication chip
Keying, frequency shift keying) mode, under FSK mode, when the bit of transmission is continuous " 0 " or continuous " 1 ", transmission
Signal is exactly sine wave；By the way that centre frequency F is arrangedRFWith carrier shift amount FDEVThe frequency f for controlling sine wave, makes sine wave
Frequency is the specific frequency, wherein when sending bit is continuous " 0 ", sine wave freuqency f=FRF-FDEV, when transmission ratio
When spy is continuous " 1 ", sine wave freuqency f=FRF+FDEV, it is transferred to step S102.
Further, when practical operation, centre frequency FRFWith carrier shift amount FDEVThe minimum resolution of setting is
FSTEP, FSTEPIt is determined by crystal oscillator frequency, and centre frequency FRF=mFSTEP(m is positive integer), sine wave freuqency f=nFSTEP(n is
Positive integer).If n < m, due to FRF=mFSTEP, f=nFSTEP, then will send bit and be set as continuous " 0 ", by carrier shift amount
FDEVIt is set as (m-n) FSTEP；If n > m, bit will be sent and be set as continuous " 1 ", by carrier shift amount FDEVIt is set as (n-
m)FSTEP。
Step S102, according to sine wave duration and bit rate the setting data length to be sent: setting the sine wave to be sent
Time span be t, then data length is arranged bit rate BitRate are as follows: t/BitRate is transferred to step S103.
Step S103, send sine wave: configuration sx1276 communication chip enters Sleep mode suspend mode, then will adjust
Type processed enters Standby mode standby mode after being set as FSK mode；Centre frequency F is setRF, carrier shift amount FDEVWith
Transmission power sets 0 for Preamble preamble length, sets SyncOn to " 0 ", synchronization character is disabled, to FIFO
The information bit of corresponding data length is written in (First Input First Output, First Input First Output) memory；Into
Enter the FSTx mode of sx1276 communication chip, waits PLL (Phase Locked Loop, phaselocked loop) Frequency Locking, frequency locker
The Tx mode for entering sx1276 communication chip after fixed starts to send sine wave；It is sinusoidal after sx1276 issues TxDone interruption
Wave is sent completely.
Step S2: after the sine wave of specific frequency is sent completely, the receiving end Xiang Jizhan is sent through OQPSK (four phases of offset
Phase-shift keying (PSK)) modulation PN sequence (Pseudo-noise Sequence, PN sequence), for base station receiving end into
Row Timing Synchronization uses.
Step S3: after PN sequence is sent completely, the receiving end Xiang Jizhan sends the coded data modulated through OQPSK, described
Coded data uses Error Correction of Coding.In the present embodiment, the Error Correction of Coding used is convolutional code.
It is understood that PN sequence and coded data sent in the present invention are modulated by OQPSK.
OQPSK modulation refers to that the code stream by same phase and orthogonal two branch has been staggered a bit period in time.Due to two branch codes
The offset of first half period will not occur two tributary bit polarity while turn over so that polarity upset only may occur all the way every time
The phenomenon that turning.Therefore, OQPSK signal phase can only jump 0 °, ± 90 °, be not in 180 ° of phase hit, as shown in Figure 2.
The formula modulated according to fig. 2 with OQPSK:
S (t)=I (t) * sin (wt)+Q (t-Tb) * cos (wt)
I (t)=A1*g(t-T)+A3*g(t-3*T)+A5*g(t-5*T)
Q (t)=A2*g(t-2*T)+A4*g(t-4*T)+A6*g(t-6*T)
Wherein, I (t) and Q (t) respectively indicate in the same direction and orthogonal two paths of signals, A1, A3, A5For the symbol of branch road in the same direction,
A2, A4, A6For the symbol in quadrature branch, sin (wt) and cos (wt) indicate to be equal to one with orthogonal two-way carrier wave, Tb in the same direction and compare
The special period, it is known that: PN sequence and coded data are after OQPSK modulating-coding, so that envelope fluctuating is small, performance is changed
It is kind, so that wireless communication data is able to achieve effective, reliable transmission.Specifically, it is passed through described in step S2 and step S3
The realization process of OQPSK modulation is as follows:
To be sent 0,1bit data conversion is at 1 or -1: being converted into 1 for 0, is converted into -1 for 1；By the number after conversion
According to being denoted as a1, a2, a3, a4, a5 ..., then real void is carried out to the data after conversion and is staggered, such as a1*j, a2, a3*j, a4,
A5*j ..., j are positive integer；To obtained real empty alternating series, since first number, if the phase of subsequent number is opposite
90 ° are increased in the phase of the number of front, then 1 is obtained, if the phase of subsequent number subtracts relative to the phase of the number of front
90 ° are lacked, then obtaining 0；Corresponding 0 or 1 data are obtained according to by real void staggered 1 or -1, then 0 or 1 data are just
Be GMSK or MSK modulation before Binary Zero, 1 data；Obtain 0 or 1 data are sent into MSK or GMSK modulation device is realized
OQPSK modulation to data.
S4: base station receiving end is synchronous with frequency deviation according to the sine wave progress channel estimation that terminal transmitting terminal is sent, according to PN
Sequence is timed synchronous and phase estimation；After frequency deviation is synchronous and Timing Synchronization, using phase estimation to coded data into
Row demodulation and decoding.
When practical operation, step S4 specifically includes following operation:
S401: base station receiving end estimates the frequency, phase and width of sine wave according to the sine wave that terminal transmitting terminal is sent
Degree；The channel response of terminal transmitting terminal is obtained according to the amplitude and phase of sine wave；According to the frequency of sine wave, by sine wave
Frequency and subtract each other to obtain frequency deviation with the smallest nominal frequency of frequency frequency difference of sine wave, to the reception signal compensation after sine wave
The frequency deviation realizes Frequency Synchronization；
S402: base station receiving end carries out related calculation the PN sequence received and known PN sequence, obtains timing offset；
The timing offset is compensated, realizes Timing Synchronization, and phase estimation is obtained according to the phase of correlation；
S403: after Frequency Synchronization and Timing Synchronization, coded data is demodulated and decoded using phase estimation.
Shown in Figure 3, the embodiment of the present invention also provides a kind of wireless data transmission system, including terminal transmitting terminal
With base station receiving end, the terminal transmitting terminal includes that sine wave transmission unit, PN sequence transmission unit and coded data send list
Member.
Wherein, sine wave transmission unit is used for: when terminal transmitting terminal is in uplink pilot time slot, the receiving end Xiang Jizhan hair
Send the sine wave of specific frequency.PN sequence transmission unit is used for: after the sine wave of specific frequency is sent completely, being received to base station
End sends the PN sequence modulated through OQPSK.Coded data transmission unit is used for: after PN sequence is sent completely, being received to base station
End sends the coded data using Error Correction of Coding modulated through OQPSK.Base station receiving end is used for: being sent according to terminal transmitting terminal
It is synchronous with frequency deviation that sine wave carries out channel estimation；Synchronous and phase estimation is timed according to PN sequence；In Frequency Synchronization and determine
When it is synchronous after, coded data is demodulated and decoded using phase estimation.
Further, shown in Figure 3, the base station receiving end includes channel estimation and frequency deviation synchronization unit, periodically same
Step and phase estimation unit and demodulating and decoding unit.Wherein, channel estimation and frequency deviation synchronization unit are used for: according to terminal transmitting terminal
The sine wave sent estimates the frequency of sine wave, phase and amplitude；Terminal is obtained according to the amplitude and phase of sine wave to send
The channel response at end；According to the frequency of sine wave, by the frequency of sine wave and with the smallest nominal frequency of the frequency frequency difference of sine wave
Rate subtracts each other to obtain frequency deviation, to the reception signal compensation frequency deviation after sine wave, realizes Frequency Synchronization.Timing Synchronization and phase are estimated
Meter unit is used for: the PN sequence received and known PN sequence being carried out related calculation, timing offset is obtained；It is inclined to compensate the timing
Difference realizes Timing Synchronization, and obtains phase estimation according to the phase of correlation.Demodulating and decoding unit is used for: in Frequency Synchronization and
After Timing Synchronization, coded data is demodulated and decoded using phase estimation.
It should be understood that system provided by the above embodiment is when being operated, only drawing with above-mentioned each functional module
Divide and be illustrated, in practical application, can according to need and be completed by different functional modules above-mentioned function distribution, i.e.,
The internal structure of system is divided into different functional modules, to complete all or part of the functions described above.
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
Under the premise of the principle of the invention, several improvements and modifications can also be made, these improvements and modifications are also considered as protection of the invention
Within the scope of.
The content being not described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (10)
1. a kind of wireless data transmission method, which is characterized in that method includes the following steps:
S1: when terminal transmitting terminal is in uplink pilot time slot, the receiving end Xiang Jizhan sends the sine wave of specific frequency, the spy
Determining frequency is randomly selected a kind of frequency from existing K kind nominal frequency；
S2: after the sine wave of specific frequency is sent completely, the receiving end Xiang Jizhan sends the PN sequence modulated through OQPSK, for
Base station receiving end is timed synchronous use；
S3: after PN sequence is sent completely, the receiving end Xiang Jizhan sends the coded data modulated through OQPSK, the coded data
Using Error Correction of Coding；
S4: base station receiving end carries out channel estimation according to the amplitude and phase of the sine wave, according to the frequency of the sine wave
Carry out Frequency Synchronization；Synchronous and phase estimation is timed according to PN sequence；After Frequency Synchronization and Timing Synchronization, phase is utilized
Position estimation demodulates and decodes coded data.
2. wireless data transmission method as described in claim 1, it is characterised in that: the terminal transmitting terminal uses
The communication chip of sx1276 model realizes that the sine wave of specific frequency is sent；
Its realization process includes following below scheme: setting FSK mode for sx1276 communication chip, under FSK mode, setting is sinusoidal
Wave frequency rate；According to the sine wave duration and bit rate to be sent, data length is set；Utilize configured sx1276 communication chip
Realize the transmission of sine wave.
3. wireless data transmission method as described in claim 1, which is characterized in that passed through described in step S2 and step S3
The realization process of OQPSK modulation is as follows:
To be sent 0,1bit data conversion is at 1 or -1；Real void is carried out to the data after conversion to be staggered；To what is obtained
Real void alternating series, since first number, if the phase of subsequent number increases 90 ° relative to the phase of the number of front,
1 is so obtained, if the phase of subsequent number reduces 90 ° relative to the phase of the number of front, 0 is obtained, according to above-mentioned
Rule obtains corresponding 0 or 1 data by real void staggered 1 or -1；Obtain 0 or 1 data are sent into MSK or GMSK
Modulator, which is realized, modulates the OQPSK of data.
4. wireless data transmission method as described in claim 1, which is characterized in that step S4 is specifically included to flow down
Journey:
S401: base station receiving end estimates the frequency of sine wave, phase and amplitude according to the sine wave that terminal transmitting terminal is sent；Root
The channel response of terminal transmitting terminal is obtained according to the amplitude and phase of sine wave；According to the frequency of sine wave, by the frequency of sine wave
Subtract each other to obtain frequency deviation with the smallest nominal frequency of frequency frequency difference with sine wave, to the frequency of the reception signal compensation after sine wave
Partially, Frequency Synchronization is realized；
S402: base station receiving end carries out related calculation the PN sequence received and known PN sequence, obtains timing offset；Compensation
The timing offset realizes Timing Synchronization, and obtains phase estimation according to the phase of correlation；
S403: after Frequency Synchronization and Timing Synchronization, coded data is demodulated and decoded using phase estimation.
5. wireless data transmission method according to any one of claims 1 to 4, it is characterised in that: in step S3, adopt
Error Correction of Coding is convolutional code.
6. a kind of wireless data transmission system, which includes terminal transmitting terminal and base station receiving end, it is characterised in that: institute
Stating terminal transmitting terminal includes sine wave transmission unit, PN sequence transmission unit and coded data transmission unit；
The sine wave transmission unit is used for: when terminal transmitting terminal is in uplink pilot time slot, the receiving end Xiang Jizhan sends special
Determine the sine wave of frequency；
The PN sequence transmission unit is used for: after the sine wave of specific frequency is sent completely, the receiving end Xiang Jizhan sends warp
The PN sequence of OQPSK modulation；
The coded data transmission unit is used for: after PN sequence is sent completely, the transmission of the receiving end Xiang Jizhan is modulated through OQPSK
Using the coded data of Error Correction of Coding；
The base station receiving end is used for: channel estimation is carried out according to the amplitude and phase of the sine wave, according to the sine wave
Frequency carry out Frequency Synchronization；Synchronous and phase estimation is timed according to PN sequence；After Frequency Synchronization and Timing Synchronization,
Coded data is demodulated and decoded using phase estimation.
7. wireless data transmission system as claimed in claim 6, it is characterised in that: the sine wave transmission unit uses
The communication chip of sx1276 model realizes that the sine wave of specific frequency is sent；Its realization process includes following below scheme: by sx1276
Communication chip is set as FSK mode, and under FSK mode, sine wave freuqency is arranged；According to the sine wave duration and bit to be sent
Data length is arranged in rate；The transmission of sine wave is realized using configured sx1276 communication chip.
8. wireless data transmission system as claimed in claim 6, it is characterised in that: the PN sequence transmission unit and volume
Code data transmission unit realizes that the process of OQPSK modulation is as follows: to be sent 0,1bit data conversion is at 1 or -1；To conversion
Data later carry out real void and are staggered；To obtained real empty alternating series, since first number, if subsequent number
Phase increases 90 ° relative to the phase of the number of front, then 1 is obtained, if number of the phase of subsequent number relative to front
Phase reduce 90 °, then obtain 0, corresponding 0 or 1 number is obtained by real void staggered 1 or -1 according to above-mentioned rule
According to；Obtain 0 or 1 data are sent into MSK or GMSK modulation device is realized and modulated to the OQPSK of data.
9. wireless data transmission system as claimed in claim 6, it is characterised in that: the base station receiving end includes channel
Estimation and Frequency Synchronization unit, Timing Synchronization and phase estimation unit and demodulating and decoding unit；
The channel estimation and Frequency Synchronization unit are used for: the frequency of sine wave is estimated according to the sine wave that terminal transmitting terminal is sent
Rate, phase and amplitude；The channel response of terminal transmitting terminal is obtained according to the amplitude and phase of sine wave；According to the frequency of sine wave
Rate subtracts each other to obtain frequency deviation, after sine wave by the frequency of sine wave and with the smallest nominal frequency of frequency frequency difference of sine wave
The reception signal compensation frequency deviation, realize Frequency Synchronization；
The Timing Synchronization and phase estimation unit are used for: the PN sequence received and known PN sequence carried out related calculation,
Obtain timing offset；The timing offset is compensated, Timing Synchronization is realized, phase estimation is obtained according to the phase of correlation；
The demodulating and decoding unit is used for: after Frequency Synchronization and Timing Synchronization, being carried out using phase estimation to coded data
Demodulation and decoding.
10. the wireless data transmission system as described in any one of claim 6 to 9, it is characterised in that: the coded number
According to the Error Correction of Coding that transmission unit uses for convolutional code.
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| CN101136893A (en) * | 2007-10-10 | 2008-03-05 | 天津大学 | A Universal Demodulation Method Based on All-Phase FFT |
| CN102957655A (en) * | 2011-08-31 | 2013-03-06 | 大唐联诚信息系统技术有限公司 | Method and system for synchronizing shaped offset quadrature phase shift keying (SOQPSK) modulation signals |
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